<template>
  <div ref="visitSource" class="visit-source"></div>
</template>

<script>
import echarts from 'echarts'
require('echarts/theme/macarons')
import resize from '@u/resize'

export default {
  name: 'VisitSource',
  mixins: [resize],
  data() {
    return {
      chart: null
    }
  },
  mounted() {
    this.$nextTick(() => {
      this.initChart()
    })
  },
  beforeDestroy() {
    if (!this.chart) {
      return
    }
    this.chart.dispose()
    this.chart = null
  },
  methods: {
    initChart() {
      this.chart = echarts.init(this.$el, 'macarons')

      let option = {
        tooltip: {
          trigger: 'item'
        },
        legend: {
          bottom: '1%',
          left: 'center'
        },
        series: [
          {
            color: ['#5ab1ef', '#b6a2de', '#67e0e3', '#2ec7c9'],
            name: '访问来源',
            type: 'pie',
            radius: ['40%', '70%'],
            avoidLabelOverlap: false,
            itemStyle: {
              borderRadius: 10,
              borderColor: '#fff',
              borderWidth: 2
            },
            label: {
              show: false,
              position: 'center'
            },
            emphasis: {
              label: {
                show: true,
                fontSize: '12',
                fontWeight: 'bold'
              }
            },
            labelLine: {
              show: false
            },
            data: [
              { value: 1048, name: '搜索引擎' },
              { value: 735, name: '直接访问' },
              { value: 580, name: '邮件营销' },
              { value: 484, name: '联盟广告' }
            ],
            animationType: 'scale',
            animationEasing: 'exponentialInOut',
            animationDelay: function() {
              return Math.random() * 100
            }
          }
        ]
      }

      this.chart.setOption(option)
    }
  }
}
</script>

<style scoped>
.visit-source {
  height: 300px;
  width: 100%;
}
</style>
